表视图问题是指在数据库中创建和使用视图时遇到的问题。下面是一个解决表视图问题的示例:
问题: 创建一个视图,该视图显示员工表中每个员工的姓名和部门名称。
解决方法:
CREATE TABLE employees (
employee_id INT,
employee_name VARCHAR(50),
department_id INT
);
CREATE TABLE departments (
department_id INT,
department_name VARCHAR(50)
);
INSERT INTO employees (employee_id, employee_name, department_id)
VALUES (1, 'John Doe', 1),
(2, 'Jane Smith', 2),
(3, 'Mike Johnson', 1);
INSERT INTO departments (department_id, department_name)
VALUES (1, 'Finance'),
(2, 'Marketing');
CREATE VIEW employee_department_view AS
SELECT e.employee_name, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;
SELECT employee_name, department_name
FROM employee_department_view;
这样,就可以通过创建和使用视图来解决员工表中每个员工的姓名和部门名称的问题。
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